Imagery, Web services > Raster data > Illinois > 2000-2004

Mosaic 7.5-minute Digital Raster Graphic (DRG) Images [Illinois]

Illinois State Geological Survey · 2003 Full Details

Full Details

Title
Mosaic 7.5-minute Digital Raster Graphic (DRG) Images [Illinois]
Description
This is a statewide ArcSDE Raster Mosaic of USGS DRG images of 7.5-minute topographic quadrangles occurring in Illinois. These are unmodified DRG images as distributed by the USGS, except (1) collar information has been removed for map tiling and (2) the data have been reprojected to the customary ISGS Lambert Conformal Conic projection (NAD 27). The map scale is 1:24,000. The map units are meters. The images were scanned at 250 dpi, giving an approximate raster cell resolution of 2.5 meters.
Creator
Illinois State Geological Survey
Temporal Coverage
2003
Date Issued
2003
Access Rights
Public
Format
Raster Dataset
Language
English
Date Added
August 28, 2025

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  • Citation
    Illinois State Geological Survey (2003). Mosaic 7.5-minute Digital Raster Graphic (DRG) Images [Illinois]. . https://clearinghouse.isgs.illinois.edu/data/reference/usgs-digital-raster-graphic-drg-mosaic (imagery)
  • BTAA Geoportal Link

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